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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.window.extensions;
import android.app.ActivityThread;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.window.extensions.embedding.ActivityEmbeddingComponent;
import androidx.window.extensions.embedding.SplitController;
import androidx.window.extensions.layout.WindowLayoutComponent;
import androidx.window.extensions.layout.WindowLayoutComponentImpl;
/**
* The reference implementation of {@link WindowExtensions} that implements the initial API version.
*/
public class WindowExtensionsImpl implements WindowExtensions {
private final Object mLock = new Object();
private volatile WindowLayoutComponent mWindowLayoutComponent;
private volatile SplitController mSplitController;
@Override
public int getVendorApiLevel() {
return 1;
}
/**
* Returns a reference implementation of {@link WindowLayoutComponent} if available,
* {@code null} otherwise. The implementation must match the API level reported in
* {@link WindowExtensions#getWindowLayoutComponent()}.
* @return {@link WindowLayoutComponent} OEM implementation
*/
@Override
public WindowLayoutComponent getWindowLayoutComponent() {
if (mWindowLayoutComponent == null) {
synchronized (mLock) {
if (mWindowLayoutComponent == null) {
Context context = ActivityThread.currentApplication();
mWindowLayoutComponent = new WindowLayoutComponentImpl(context);
}
}
}
return mWindowLayoutComponent;
}
/**
* Returns a reference implementation of {@link ActivityEmbeddingComponent} if available,
* {@code null} otherwise. The implementation must match the API level reported in
* {@link WindowExtensions#getWindowLayoutComponent()}.
* @return {@link ActivityEmbeddingComponent} OEM implementation.
*/
@NonNull
public ActivityEmbeddingComponent getActivityEmbeddingComponent() {
if (mSplitController == null) {
synchronized (mLock) {
if (mSplitController == null) {
mSplitController = new SplitController();
}
}
}
return mSplitController;
}
}
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